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Here, crater geometries produced by the ablation process during laser induced plasma spectroscopy elemental depth profiling, are investigated by means of 3D microscopy. Deep depth profiles are often required in the characterization of cultural heritage artefacts such as archaeological bronzes. This work aims at finding the optimal irradiance conditions in order to sample large depths in bronzes with...
CH3NH3PbI3 layers have been prepared by two-step procedure (spin coating and dipping) on flat substrates under ambient conditions with uncontrolled relative humidity. The films have been characterized by means of scanning electron microscopy, absorption coefficient and x-ray diffraction when varying spinning rate, washing procedure, and dipping time. In particular a novel washing procedure has been...
In this paper, a methodology for the analysis of subcellular morphology with chemical specificity, for images obtained by Stimulated Raman Scattering microscopy, is described. In order to detect microstructures inside the cells, a segmentation method based on a threshold algorithm and on a region growing process is proposed. Validation tests on images of polystyrene beads and of on adipocyte cells...
Conductive non stoichiometric TiO2-based films attract considerable interest for their photocatalytic, photovoltaic and photoelectrochemical applications. In this work, transparent and conductive TiOx and TiO2:Nb films were fabricated by e-beam evaporation at 250°C in oxygen deficient atmosphere starting from commercial powders, while TiO2:Nb films and TiO2:Nb/Ti multilayer systems were grown at room...
Traditionally, the LIDAR technique has been successfully applied to the detection of concentrated smoke plumes emitted by wildfires. In this paper, it is shown how LIDAR measurements can also be deployed to determine the profile of the backscattering coefficient in the presence of widespread smoke, which can be the consequence of strong wind dispersion or non-concentrated sources. To this end, innovative...
Gold nanorods (GNRs) were investigated to enhance light absorptionin co-sentitized dye solar cells (c-DSSC), thanks to their plasmonic characteristics. Pastes were obtained by directly mixing GNRs with titania. The resulting thin films differ for sintering conditions and GNRs concentration. The reported study is based on the absorbance spectra of the different samples, together with SEM and TEM to...
Optically selective low-emissive (low-E) filters, constituted of different ultrathin layers and suitable to an effective employment in glazing technology for low energy consumption buildings have been designed and fabricated on glass by means of sputtering technique. Sputtering process parameters, layers sequence of the stacked structure and thicknesses of the layers have been selected by means of...
Naturally birefringent crystals are fundamental components of devices with many fields of application, from high energy physics and biomedical devices, to lasers. Crystals functional properties are related to their quality. Non-destructive tests are mandatory to check and improve the quality of these expensive materials as well as to control the growth process. In this paper, a set of methods are...
The fabrication and biological application of a grating-based plasmonic lab-on-chip aimed at the parallel detection of multiple reactions are here demonstrated. This work answers to the recent biosensing requirements of high throughput and compact detection equipment. Laser interference lithography (LIL), UV photolithography and metal etching techniques were combined to realize a compact device able...
This work discusses the phenomenon of multipath interference in bend-insensitive optical fibers and components that arises when these devices work at wavelengths approaching the multimode regime. After recalling the rationale behind this study and some technical hints about the measurement setup, the paper focuses on the characterization of field-installable connectors and optical fiber splitters...
In recent years the development of silicon micromachining technologies has required more efforts in research to find non-contact measurement techniques for in-depth, non-destructive inspection of layered and microstructured samples. In this work, we apply a optical low-coherence reflectometry for in-plane and out-of-plane measurements aimed at detecting the optical path between hidden interfaces of...
The advances in proteomics and genomics have led to discover a lot of biomarkers that can potentially be used as diagnostic and prognostic indicators of diseases. Simultaneously, a huge research effort has been invested in developing biosensors that could monitor the interaction of biological materials. Such sensors are required to be fast, real time, label free and highly sensitive to the appropriate...
The frequency noise power spectral density (FNPSD) of a room-temperature distributed-feedback quantum cascade laser (DFB-QCL) was calculated by performing voltage noise measurements directly at the laser terminals. The integration of the FNPSD allowed estimating the linewidth of the laser both free-running and under optical feedback by using the P-line method. The comparison with the recently reported...
Following the requirement of optical network operators to assess the merit of physical layer technologies on optical network performances, we perform a statistical comparison of two possible implementations of flexible rate transceivers to enable the elastic network paradigm. Using the recently proposed Statistical Network Assessment Process (SNAP) we compare the average bitrate per lightpath that...
The implementation of solutions based on re-configurability and Software Defined Networking (SDN) are surely among the main challenges for network providers today. In analogy to the SDN paradigm, the present paper proposes the adoption of an innovative approach based on traffic adaptability in a unified all-optical metro-access network architecture. The purpose is to enable bandwidth sharing among...
Reflective semiconductor optical amplifier (RSOA)-based self-seeded (SS) transmitters have proved to be compact self-tuning transceivers for wavelength division multiplexed passive optical networks (WDM PONs). The small electro-optical bandwidth of currently available RSOA devices limits the maximum bit-rate for each transmitter. We thus propose a self-tuning WDM PON multilevel transmitter based on...
Keratoconus is an ophthalmic disease in which the cornea acquires an abnormal conical shape that prevents the correct focusing on the retina, causing visual impairment. The late diagnosis of keratoconus is among the principal causes of corneal transplantation surgery. In several previous studies, a different organization sutural lamellae was observed in keratoconic corneas compared to healthy corneas...
In the framework of the increasing phenomenon of antibiotic-resistant infections, those caused by Helicobacter pylori (Hp) have a particular significance, being worldwide diffused and associated with severe pathologies, among which gastric cancer. To overcome antibiotic-resistance, we propose the use of photodynamic therapy (PDT), based upon cytotoxic species production following bacteria illumination...
Here we present a study of single processive myosin motors based on the combination of optical tweezers and fluorescence imaging techniques. Ultrafast force-clamp spectroscopy [1] is applied to study the dependence of the chemo-mechanical properties of myosin on load and on ATP concentration. On the other hand, single molecule localization through FIONA (Fluorescence Imaging with One Nanometer Accuracy)...
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